I'm trying to move underscore to lodash. But this line of code baffles me.
On my current project we have this line of code.
obj = _.pick(obj, _.identity);
Which is pretty obvious that it's trying to delete empty property.
Now when I switch to lodash, the same line of code returns empty object for me.
I'm trying to figure why. How do I achieve the same effect in lodash?
I tried this on both lodash and underscore websites. They produce different results.
This is from lodash
var obj = {_v:'10.1', uIP:'10.0.0.0', _ts:'123'}
_.pick(obj, _.identity);
Object {}
This is from underscore
var obj = {_v:'10.1', uIP:'10.0.0.0', _ts:'123'}
_.pick(obj, _.identity);
Object {_v: "10.1", uIP: "10.0.0.0", _ts: "123"}
Why _.pick(object, _.identity) in lodash returns empty Object?
Because pick
in lodash expects an array of property names to be passed to it:
var object = { 'a': 1, 'b': '2', 'c': 3 };
_.pick(object, ['a', 'c']);
// → { 'a': 1, 'c': 3 }
How do I achieve the same effect in lodash?
Lodash has a method called pickBy
which accepts a callback function:
var object = { 'a': 1, 'b': '2', 'c': 3 };
_.pickBy(object, _.isNumber);
// → { 'a': 1, 'c': 3 }
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